Automatic Restart; Figure 29 Refrigerant Line Components - Emerson Liebert CRV User Manual

Checks to Perform after Startup
Once the system is operating under load, check the various components, as follows:
1. Verify that the fans are operating properly.
2. Ensure that the temperature and relative humidity are being controlled, and that the humidifier
(optional) and heating steps (optional) operate when required.
3. Ensure that the compressor operates when required.
4. Ensure that the fan operation controller on the external condenser/drycooler (if fitted) is
calibrated correctly, and that it controls the fan operation.
5. Record all of the following on the warranty inspection form:
a. All component voltages and current draws
b. All air / water temperatures indoor and outdoor
c. All refrigerant and water / glycol pressures,
d. All levels of refrigerant and oil in sight glasses
e. Record refrigerant pressure switch settings and operating pressures
f. Record superheat and sub-cooling.
9.2

Automatic Restart

If desired, the unit will automatically restart on the return of power after a supply interruption (see
Figure 90).
To avoid an automatic cold restart of the compressor if a power interruption of several hours is
expected, stop the unit before the blackout. After power returns, allow the compressor to preheat
before restarting the unit.

Figure 29 Refrigerant line components

Liquid Receiver Valve
Solenoid Valve
Thermostatic
expansion
valve
Filter
Dryer
Inlet
Schrader
Valve
41
Sight Glass
Liebert
Startup
Filter
Dryer
® ™
CRV